I would like to know what are the settings capabilities on workshop charts when implementing multiple layers.
Here is an example of a chart with 2 layers (3 objects):

Among the global settings options, I would like to know:
- how to have only one legend per group, instead of one per layer?
- how to manage colors? Is it possible to change default?
- is there any way to display dotted lines for example?
Thanks in advance

